add cent function

go/gopath/src/fohow.com/apps/controllers/cent_controller/cent_controller.go

@@ -170,7 +170,7 @@ func (self *CentController) SignEveryday() {
 		self.ReturnError(403, apps.RedisGetError, "", nil)
 	}
 	beego.BeeLogger.Warn("Result()%v", result)
-	if result != nil {
+	if result.TodaySignNum > 0 {
 		self.ReturnError(403, apps.DailySignRepeat, "", nil)
 	}
 	yesterdayResult := &CountDownSignDaily{}